Revert "audio: Add support for non-pcm VOIP vocoders"

This reverts commit 9f0c5d241bb3c69aa134ce3de7f6b08c7b227140.

Conflicts:

	media/libmedia/AudioRecord.cpp
	media/libmedia/AudioTrack.cpp
	services/audioflinger/Threads.cpp
	services/audioflinger/Tracks.cpp

Change-Id: Ia8823e7986fa7786ccd3c8f233aa6ff940da2ae6